/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.kafka.streams.state.internals;
import org.apache.kafka.common.serialization.Serdes;
import org.apache.kafka.streams.KeyValue;
import org.junit.Before;
import org.junit.Test;
import java.util.NoSuchElementException;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
public class DelegatingPeekingKeyValueIteratorTest {
private final String name = "name";
private InMemoryKeyValueStore<String, String> store;
@Before
public void setUp() throws Exception {
store = new InMemoryKeyValueStore<>(name, Serdes.String(), Serdes.String());
}
@Test
public void shouldPeekNextKey() throws Exception {
store.put("A", "A");
final DelegatingPeekingKeyValueIterator<String, String> peekingIterator = new DelegatingPeekingKeyValueIterator<>(name, store.all());
assertEquals("A", peekingIterator.peekNextKey());
assertEquals("A", peekingIterator.peekNextKey());
assertTrue(peekingIterator.hasNext());
}
@Test
public void shouldPeekNext() throws Exception {
store.put("A", "A");
final DelegatingPeekingKeyValueIterator<String, String> peekingIterator = new DelegatingPeekingKeyValueIterator<>(name, store.all());
assertEquals(KeyValue.pair("A", "A"), peekingIterator.peekNext());
assertEquals(KeyValue.pair("A", "A"), peekingIterator.peekNext());
assertTrue(peekingIterator.hasNext());
}
@Test
public void shouldPeekAndIterate() throws Exception {
final String[] kvs = {"a", "b", "c", "d", "e", "f"};
for (String kv : kvs) {
store.put(kv, kv);
}
final DelegatingPeekingKeyValueIterator<String, String> peekingIterator = new DelegatingPeekingKeyValueIterator<>(name, store.all());
int index = 0;
while (peekingIterator.hasNext()) {
final String peekNext = peekingIterator.peekNextKey();
final String key = peekingIterator.next().key;
assertEquals(kvs[index], peekNext);
assertEquals(kvs[index], key);
index++;
}
assertEquals(kvs.length, index);
}
@Test(expected = NoSuchElementException.class)
public void shouldThrowNoSuchElementWhenNoMoreItemsLeftAndNextCalled() throws Exception {
final DelegatingPeekingKeyValueIterator<String, String> peekingIterator = new DelegatingPeekingKeyValueIterator<>(name, store.all());
peekingIterator.next();
}
@Test(expected = NoSuchElementException.class)
public void shouldThrowNoSuchElementWhenNoMoreItemsLeftAndPeekNextCalled() throws Exception {
final DelegatingPeekingKeyValueIterator<String, String> peekingIterator = new DelegatingPeekingKeyValueIterator<>(name, store.all());
peekingIterator.peekNextKey();
}
}